Method for Installation of Conceal & Surface Conduits (Part-2)

METHOD FOR INSTALLATION OF CONCEAL & SURFACE CONDUITS (PART-2)

September 18, 2021 1 Comment

4.FILLING CHASING AREA:

All grooves, chases shall be properly filled and concreted and finished up to the wall surface before plastering of walls is taken up. The conduit boxes, accessories, joints, etc. shall be laid along with the conduits. The chases shall be sufficiently deep and properly filled with cement mortar. * Where conduits pass through expansion joints in the building, adequate expansion fittings or other approved services shall be used to take care of any relative movement. As far as possible, chasing of wall to embed the conduits to be avoided. * Chasing is filled by Cement mortar 1:5 ratio(1 portion of the cement+5 portion of sand) shall be used for patchwork in chased area and its surface is rough so main plaster will easily joint on chasing area. * Curing shall be carried out for a minimum of three days. * Make sure the conduits are not visible from outside their route which could lead to improper plastering.

5.WIRE MESH:

After chasing area is filled by mortar, Chicken (wire) mesh and GI nails shall be applied on chasing area to avoid hair crack in plaster. * Width of Chicken Mesh is slightly larger than chasing Area. After installation of Chicken mesh final Plaster should be done. * Make Sure that Nails for Wire Mesh should not damage the Buried PVC Conduit.

6.SURFACE CONDUCTING:.

Take the approved Drawings of Electrical conduit Shop Drawing with section details, MEP coordination drawing with section details and Architectural Drawings. * Ensure that the civil people have finished block wall and Plastering with adequate curing and clearance is given to proceed for electrical works. * Check the required reference markings are available for FFL (finished floor levels). * All required materials shall be shifted and stored under safe custody near workplace on daily basis as per planned quantity.

1 ) MARKING OF CONDUITS:

Site Engineer will carry out a site survey where the PVC Conduit will be installed as per approved shop drawings. * Mark the exact position of the conduit route with the blue marker string and then install conduit saddles. * All runs must be installed as a complete system before any conductors are pulled into them. In other words, a run of conduit (to include conduit, fittings, and supports) must be complete before the conductors are installed. * A run of conduit should be as straight and direct as possible. When a number of conduit runs are to be installed parallel and next to each other, install them all at the same time.

(A) PVC Conduit and Accessories:

Conduits shall run vertically or horizontally only for surfaced run conduits. * Install the correct Type and size of the conduits as per approved Specification and drawing. * Conduit pipes shall be fixed by heavy gauge saddles, secured to suitable wood plugs or other approved plugs with screws in an approved manner at an interval of not more than 1 meter but on either side of the couplers or bends or similar fittings, saddles shall be fixed at a distance of 30cm from the center of such fittings. * The saddles should not be less than 19MM (width) of 24 gauge for conduits up to 25 mm dia and not less than 25mm (width) of 20 gauge for larger diameter conduits. * Where conduit pipes are to be laid along the trusses, steel joint etc. the same shall be secured by means of special clamps made of MS. Where as it is not possible to drill holes in the trusses members suitable clamps with bolts and nuts shall be used.

Where conduit pipes are to be laid above false ceiling, either conduit pipes shall be clamp to false ceiling frame work or suspended with suitable supports from the ceiling slab. * For conduit pipe run along with wall, the conduit pipe shall be clamped to wall above false ceiling in uniform pattern with special clamps if required to be approved by the Engineer-In-Charge at site. * Check to ensure no sharp edges within the conduit joints for surfaced conduit and to ensure proper bonding for all conduit joint for concealed PVC conduit by foreman / skill worker / sub-contractor. * All joints in PVC conduits, other than screwed joints, shall be cemented with a waterproof adhesive. This adhesive shall be as recommended by the conduit manufacturer. * All saddles, tubes and boxes must be in perfect alignment to avoid any appearance of warping when the installation is complete. Saddles should not be so tight as to prevent expansion of the conduit. * Power conduit and LV conduit need to be separate. Power, Lighting Circuit should be run in separate conduit than LV circuit (Data wire, Telephone wire, TV wire) conduit. * Conduits shall not be run closer than 15m to any steam or hot water pipes and shall be run underneath such pipes rather than over them. * Conduits should not a…